Riveter suspension



July so, 1929. J, c, N 1,722,793

RIVETER SUSPENSIdN Filed Feb. 14, 1925 2 Sheets- Sheet 1 I July 30, 1929.

-J. c. HANNA RIVETER SUSPENS ION 2 Sheets-Sheet 2 Filed Feb. 14, 1925 Patented July 30, 1929.

UITED ST 1,722,793 earr OFFICE.

JOHN C. HANNA, OF CHICAGO, ILLINOIS, ASSIGNOR T HANNA ENGINEERING WORKS, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

RIVETER SUSPENSION.

Application filed February 14, 1925. Serial No. 9,181.

This invention relates to a new and improved riveter suspension and more particularly, to a form of suspension whereby the movable plunger may remain stationary relative to the point of support while the fixed die moves relative to such point of support.

A common type of riveter is comprised of a strain yoke or frame; a die mounted immovably on the frame; and a mechanism mounted on the frame to move a plunger and die relative to the fixed die and frame. These riveters are normally suspended from the frame by a bail and thus the frame and fixed die are stationary while the plunger and its die are movable relative to the work.

Riveters of this type when used on vertical rivets and, consequently, positioned with'die axis vertical are usually suspended with mechanism above and fixed die below the work, inasmuch as there is seldom room below the work for the mechanism. In certain types of riveting work, however, it is highly desirable that the upper die remain stationary relative to the work and that the lower die move vertically relative to the work, as would be the case if a common riveter were suspended with mechanism below the work and fixed die above. This permits the heads of the rivets to be struck at the top and the rivets driven from the bottom, and results in a greater production from the machine for a given number of men in the operating crew since the rivets may be inserted far in advance of the riveter. Each rivet demands less of the sticker-ins? attention and time and continuous operation of the riveter is not interrupted.

It is an object of the present invention to provide supporting means for a common yoke type riveter positioned with mechanism above the work whereby upon operation of the riveter the movable plunger willremain stationary relative to the point of support,

and the fixed die will be moved relative to said point of support. a

It is a further object to provide a riveter support of this character adapted for supporting the riveter at a point above its center of gravity by means of a pivoted connection.

It is also an object to provide that the pivotal point at which the supporting bail is'attached to the riveter shall be the minimum distance above the center of gravity of the riveter which will result in the riveter assuming positively a position of rotation about the pivotal point wherein the die axis is vertical due entirely-to force of'gravity. ,The reason for this provision is twofold. First, such location of pivotal point allows that the riveter may be rotated manually about the point to move the upper die on and ofi the upper head of the rivetwith the minimum effort. Second, the minimum ratio exists between the vertical distance and the horizontal distance from the upper die end to the-pivotal point, consequently rotational movement of the riveter about the pivot results in upper die movement which is as near vertical in direction as possible. This latter is an obvious operating advantage,

Other and further objects will appear as the description proceeds.

ing the fixed die 12 and the movable plunger 13 which plunger, carries the movable die 14:. The movable plunger 13 is operated by power furnished through cylinder '15 and a toggle connection 16 which is old in the art, and forms no part of the present invention. The link 17 is pivotally connected at '18 to the riveter frame 11. One end of the link 17 is pivotally connected at 19 to the supporting bail 20. The oppositeend 25 0f the link 17 is connected by means of the flexible connector; 21 to the equalizer member '22, which latter is connected by stud 23 to the upper end of the plunger 13. The flexible connector 21 passes over the pulley 24 whic is carried by the frame 11. y y

The point 19 is so located as to be above the center of gravity ofthe assembly when the plunger 13 and the diesextend vertically. The parts are shown in Figures 1 and 2 with the dies in their closed position. The entire assembly is in its upper position. In the operation of the apparatus, the toggle construction 16 is operated to raise the plunger 13 relative to the frame 11. During this movement, the flexible connectors or chains 21 pass around the pulleys 24 and permit the links 17 to rotate in the counter-clockwise direction about the pivot points 18. The

tion of the construction.

'wardly 2" and the point 18 is half way between the point 25 and the point 19, the point 18 will move downwardly 1. This will thus serve to move the frame and fixed die down 1 relative to the point of support and if the movable die remains stationary relative to the point of support, it will separate the dies 1. That the plunger 13 does remain stationary will be apparent from considera- Since the pulley 24 moves down 1 and the point 25 at one end of the flexible connectors 21 moves downwardly 2, this serves to take up all of the slack in the connectors 21 and the plunger remains stationary relative to the point of support 19. j I 7 It will be apparent that the links, 17, flexible connectors 21 and equalizer 22 may be removed if desired and the riveter operated in the usual manner by connecting the bail :to the frame at the boss 26 located above the changes and modifications as come within the spirit and scope of the appended claims.

I claim:

V 1. In aj riveter construction, a riveter frame, a fixed. die, a movable plunger and plunger operating means supported upon the frame, a link pivotally secured directly to the frame, a riveter support pivotally connected to the link at a point above the center of gravity of the riveter, and a flexible member connected to the link and the movable plunger whereby the movable plunger remains stationary relative to the point of support when the plunger is actuated and the frame and fixed die are moved vertically relative to the point of support. V

2. In a riveter construction, a riveter frame, a fixed die, a movable plunger and plunger operating means supported upon the frame, a link pivotally secured to the frame, a riveter support pivotally connected to the link at a point above the center of gravity of the riveter, and a flexible member passing over a pulley carried by the frame and connected to the link and the movable plunger whereby the movable plunger remains stationary relative to the point of support when the plunger is actuated and the frame and fixed die are moved vertically relative to the point of support.

3. In a riveter construction, a riveter frame, a fixed die carried by the frame, a movable plunger and plunger operating means supported upon the frame, a support for the riveter, a link pivoted directly to the frame at an intermediate point and connected at one end to the movable plunger and at end to the movable plunger and at the other end to the support, the connection between the movable plunger and link end comprisin flexible members passing over pulleys carried by the frame.

5. In a riveter construction, a riveter frame, a fixed die carried by the frame, a movable plunger and plunger operating means supported upon the frame, a support for the riveter, a link pivoted to the frame at an intermediate point andconnected at one end to the movable plunger and at the other end to the support, the connection between the movable plunger and link end comprising flexible members passing over pulleys carried by the frame, the point of connection of the link to the frame being equidistant from the points of connection of the link to the support and to the flexible members. I

Signed'at Chicago, Illinois, this 7th day of February, 1925. 

